Single acting pump



Julj' 22, 1952. E; L. FITCH SINGLE ACTING PUMP Filed March 4, 1947 l N vs N TO R5 EDMUND L.FITCH ATTORNEYS y 22, 1952' E. L. FITCH 2,604,054

SINGLE ACTING PUMP Filed March 4, 1947' 2 SHEETSSHEET 2 INVENTOR.

gmuu/w L. FITCH Patented July 22, 1952 ED. S AT ATE TfF- F CE l2.604.054- I 'V I 'lfsrNGL EnorrInG 'EdmundL'fiFitch, Dayton, Ohio,assignor'to'The r 'Dayton Steel Foundry Company, Dayton;'0hio, y w acorporation'ofohio Application March}, 1947, sens n 732,250

"The present inventionhas as its" object the designi'ng of' anew form ofsingle acting pump which will "operate to discharge the fluid beingpumped onthe down stroke of the pump. The

' 2' Claims. (Cl. 103159) located the transverse pivot pivoted the pumpcylinder 1 0.

' As shown in detail in Fig. 3, the pump cylinder isprovided at itslower end with a fluid tight pin 6 on which is construction shown issimple, made of few parts bushing H through which reciprocates therod'l2 and inexpensive to manufacture, yet is very efficarrying thepiston head l3, both the rod and cient in its operation. As it utilizesthe weight the piston head being suitably packed, preferably of theoperator on the down stroke to force the with standard 0-rings,"such ascommonly used fluid through the pump it is extremely easy to for suchpurposes. f operate. 10 Q In'the wall of the cylinder below the pistonIt is also an object of the invention to design head is tapped the inletand in the top of the a pump which can be readily adapted to differentcylinder is the outlet IS, the two pipes l5 and J6 requirements, itbeing possible to adjust the pump beingconnected'ias shown, anadjustable by -pass to deliver relatively large volumes at low pressuresvalve' ll being located between'the connections orsmaller volumes athigher pressures. 15 I5 and 16. Since the'pu'mp' cylinder rocks aboutThe best known and preferred form of the inthe pivot 6" during itsoperation the piping is vention is shown and described, but it will beconnected to the inlet and outlet for the fluid understood that thedetails of construction are by'fiexible'hose as indicated. not essentialand may be varied within the scope In the head of the piston is locatedthe valve of the-appended claims. chamber 20 which communicates with theinlet In the drawings which show the pump in its side of the piston bythe T-shaped passage 2| perfected form: over which is located the springheld ball valve Fig. 1 is a side elevation of the pump, the full 22. Anapertured plug 24 retains the valve on lines showing the handle in anintermediate posiits seat. The head of the cylinder is provided tion,perpendicular to the axis of the pump, the 25 with the outlet passage 25leading to the port l6 extreme positions of the handle attained duringand in this passage is located the spring pressed pumping beingindicated in broken lines. ball valve 26.

Fig. 2 is a View looking at the front of the To reciprocate the piston,the rod l2 isthreaded device. at its lower end and at this point isattached the Fig. 3 is a somewhat enlarged section on the yoke 30 in thelower end of which is located a line 3-3 of Fig. 2. pivot pin 3| onwhich is pivoted the end of an Fig. 4 is a perspective view taken at thefulcrum perating rod or lever 32 which extends to the for the operatinghandle. right as shown in Fig. 1. The operating lever is Fig. 5 is aview similar to Fig. 1, showing the slidably received in a transversepassage 36 handle in an adjusted position, axially of the formed throughthe center of a heavy bearing slide mounting in its fulcrum pivot, andsleeve 31 mounted for rotation in thebushing's Fig. 6 is a view similarto Fig. 5, showing the 5, the sleeve being held in position by snaprings handle inserted in an alternative socket, and with 38 at eitherside of the bushings. the apparatus arranged for highest possible me-The slide fit between the rod 32 and the sleeve chanical advantage. 403'! permits the operator to vary the distance be- The pump shown hereinas the specific emtween the fulcrum and the point 3| to lengthenbodiment of the invention is intended to be or shorten the work arm ofthe lever and the mounted on the wall of a room or building, the t k ofth piston and thereby adj t the pump framework of machinery or vehicle,or on some for delivering fluid at the varying volumes and oth r pe tpport. The pu p is t d pressures. The pivot 6 permits the cylinder Illbetween two parallel angular bracket members to shift its position, inaccordance with the ador arms I, the ends of which are welded to upperjusted position of lever 31 In the full lines in and lower vertical baseplates 2 and 3 which are Fig. 1 the pump is shown as set forapproximately provided with apertures 4 by which the pump the longeststroke of the piston. m y y be fixed to a support of r quisite Fixed tolever 32, as by a pin 40, is a dual socket S il y member comprisingdivergent sleeves 4|, 42, The angles or elbows of the bracket aresomejoined by a triangular web 43, each sleeve adapted what enlarged asshown and at these points two to receive the handle 44, which may haveahand aligned bushings 5 are welded in openings in the grip 46. bracket.Near the upper end of the bracket is 56 As seen in Fig. 1, lever 32 isperpendicular to screw 41 in sleeve 31, seen in Fig. 4, if desired.

In Fig. 5, the lever 32 is shown adjusted out-- wardly to yield highermechanical advantage. As in the case of Fig. 1, a mean position of thehandle is assumed wherein lever 32: is perpenw dicular to the axis ofcylinder Ill. -This position is easily found and maintained, for themaximum positions of the handle on either side of the mean are critical,and beyond these positions the lever slides suddenly. However, it iseasy to maintain.

the lever within the critical range'of swing. The adjustment shown inFig. 6 is employed for very high mechanical advantage. In this case thelever 32 is swung outward to amaximum. limiting position, with-itsinnerend abutting fulcrumsleeve 31... Since outward sliding of rod 32 inthis case is not possible, the sleeve 31 may be turned until lever 32and cylinder in form an obtuse angle, and the pumping is occasioned bytoggle action. In such an arrangement, the lever 32 is turned'ataconsiderable angle below the horizontal, and it will therefore beconvenient to insert handle 49 in auxiliary sleeve 42. V It will be seenthat avery simple but very effective pump construction hasfloeen devisedand that in allcases the operation of the pump on its delivery stroke isaided by the weight of the operator. It will also be seen that the pumpis quickly adaptable for either high or low pressure delivery withcorresponding changes in the volume delivered. r

The pump may be used either as a hydraulic or pneumatic pump.

What is claimed is:

1. In a pump, a supporting structure, a fluidpressure unit comprisingcooperating piston and cylinder elements, one of which elements ispivotally attached to the supporting structure, a pivot rotatablycarriedina' portion of the supporting structure,:and an operating leverhaving a straight portion received in said pivot for sliding adjustmentwith respect thereto, and said lever having one of its ends pivotallyattached to the other of said elements.

. 2. .In a pump, a supporting structure, a fluidpressure unit comprisingcooperating piston and cylinder elements, one of which elements ispivotally attached to the supporting structure, a

pivot rotatably carried in a portion of the supporting structure, and anoperating lever having a straight portion received in said pivot foradjustment with respect thereto in a direction transversely of the pivotaxis, and said lever having one of its ends pivotally attached to theother of said elements.

EDMUND L. FITCH.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Great Britain Jan. 3,1929

